在学习C++时，敲的一个书上的代码，但是结果有误，求大神指点
#include <iostream>#include <cmath>
using namespace std;
class Point
{
public:
Point(int xx=0,int yy=0)
{
x=xx;
y=yy;
}
Point(Point &p);//就是利用Point p来给其赋初值
int getX() {return x;}
int getY() {return y;}
private:
int x,y;
};
Point::Point(Point &p)
{
x=p.x;
y=p.y;
cout << "Calling the copy constructor of Point " << endl;
}
//类的组合
class Line
{
public:
Line(Point xp1,Point xp2);
Line(Line &1);
double getLen() {return len;}
private:
Point p1,p2;
double len;
};
//组合类的构造函数
Line::Line(Point xp1,Point xp2):p1(xp1),p2(xp2)
{
cout << "Calling constructor of Line" << endl;
double x=static_cast<double>(p1.getX()-p2.getX());
double y=static_cast<double>(p1.getY()-p2.getY());
len=sqrt(x*x+y*y);
}
//组合类的复制构造函数
Line::Line(Line &1):p1(1.p1),p2(1.p2)
{
cout << "Calling the copy constructor of Line " << endl;
len=1.len;
}
//主函数
int main()
{
Point myp1(1,1),myp2(4,5);
Line line(myp1,myp2);
Line line2(line);
cout << "The length of the line is: ";
cout << line .getLen() << endl;
cout << "The length of the line2 is:";
cout << line2.getLen() << endl;
return 0;
}
怎么有一个浮点后缀常熟的错误提醒？？？
求大神解释
